Rear washer fluid enable/disable

ABSTRACT

A method and apparatus for preventing the dispensing of a washer fluid onto a rear windshield upon detecting the disablement of the rear wiper arm is provided. The disablement of the rear wiper arm may be caused by the movement of the rear windshield from a fully closed position to an open position.

I. BACKGROUND OF THE INVENTION

A. Field of Invention

This invention pertains to the art of methods and apparatuses regardingvehicle window washer devices, and more specifically to apparatuses andmethods regarding rear window washer fluid control devices.

B. Description of the Related Art

It is known to manufacture a vehicle that includes a rear windshield.Often, the rear windshield can be opened or lowered independent of arear-facing door or tailgate. The opening or lowering of the rearwindshield allows an operator to conveniently access the rear interiorportion of the vehicle. Commonly, the rear windshield is used incombination with a rear wiper system. The rear wiper system may comprisea wiper arm that oscillates across the rear windshield in order toimprove the vehicle operator's rearward field of view. Additionally, therear washer system may allow the vehicle operator to selectivelydispense or spray a fluid, commonly referred to as washer fluid, ontothe rear windshield, in conjunction with the oscillation of the wiperarm, thereby increasing the effectiveness of the rear wiper system invarious circumstances. Commonly, a single selector device comprising acombination switch, as is well known in the art, is used to selectivelycontrol the operation of the rear wiper system.

When an attempt is made to open or lower the rear windshield duringoperation of the rear wiper assembly, a control unit may cause the wiperarm to “force park” or move to a predetermined position, commonlyreferred to as a “parked position,” prior to causing the rear windshieldto open or lower. The parked position may require the wiper arm to bepositioned out of contact with the rear windshield such that the wiperarm will not impede the opening or lowering of the rear windshield. Uponmovement of the wiper arm to the parked position, the control unit maythen cause the rear windshield to open. Commonly, the control unit willcause the rear wiper arm to resume operating upon movement of the rearwindshield back to the fully closed position.

Although known methods work well for their intended purpose, severaldisadvantages exist. Despite the wiper arm being disabled upon theoccurrence of a predetermined condition, the rear wiper system is stillable dispense or spray washer fluid. The use of a single selector deviceto control the operation of the rear wiper system frequently results inoperator error during manipulation of the selector device. For example,an operator intending to cause washer fluid to be dispensed on thevehicle's front windshield may unintentionally manipulate the selectordevice in the wrong direction and instead cause washer fluid to bedispensed or sprayed onto the rear windshield. If the rear windshield islowered or otherwise opened when the rear washer is erroneouslyselected, the dispensed washer fluid may enter the interior portion ofthe vehicle. Additionally, because the wiper arm is disabled or parkedas a result of the rear windshield being opened or lowered, it may takean increased amount of time to detect the erroneous selection. Theincreased detection time may result from the vehicle operator hearingthe associated washer pump operating combined with not seeing any washerfluid being dispensed onto the intended windshield. The increaseddetection time may result in an increased amount of washer fluidentering into the interior portion of the vehicle thereby increasing theamount of damage caused.

What is need then is a method and apparatus for preventing thedispensing of washer fluid onto the rear windshield when the rearwindshield is not in a fully closed position.

II. SUMMARY OF THE INVENTION

According to one embodiment of the invention, a method comprises thesteps of receiving a first input signal, determining the position of arear windshield, and operating a washer motor pump. The first inputsignal initiates a process for causing the operation of the washer motorpump. The washer motor pump operates to dispense a fluid onto the rearwindshield only if the position of the rear windshield is determined tobe fully closed.

According to another embodiment of the invention, a method comprises thesteps of receiving a first input signal, determining the position of arear windshield, operating a washer motor pump, determining theactuation of one of a plurality of operator actuated devices for causingthe rear windshield to move from the fully closed position, and causingthe termination of the operation of the washer motor pump. The firstinput signal initiates a process for causing the operation of the washermotor pump. The washer motor pump operates to dispense a fluid onto therear windshield only if the position of the rear windshield isdetermined to be fully closed.

According to another embodiment of the invention, a method comprises thesteps of receiving a first input signal, determining the position of arear windshield, determining the position of a lift gate, and operatinga washer motor pump. The first input signal initiates a process forcausing the operation of the washer motor pump. The washer motor pumpoperates to dispense a fluid onto the rear windshield only if theposition of the rear windshield and the position of the lift gate aredetermined to be fully closed.

According to another embodiment of the invention, a method comprises thesteps of receiving a first input signal, determining the position of arear windshield, determining the position of a lift gate, operating awasher motor pump, determining the actuation of one of a plurality ofoperator actuated devices for causing the lift gate to move from thefully closed position, and causing the termination of the operation ofthe washer motor pump. The first input signal initiates a process forcausing the operation of the washer motor pump. The washer motor pumpoperates to dispense a fluid onto the rear windshield only if theposition of the rear windshield and the position of the lift gate aredetermined to be fully closed.

According to another embodiment of the invention, a method comprises thesteps of receiving a first input signal, determining the position of arear windshield, operating a washer motor pump, and oscillating a rearwiper arm between a first operating position and a second operatingposition. The first input signal initiates a process for causing theoperation of the washer motor pump. The washer motor pump operates todispense a fluid onto the rear windshield only if the position of therear windshield is determined to be fully closed.

According to one embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshieldencloses the aperture and the rear wiper-washer system comprises a rearwiper assembly, a fluid supply portion, an actuator portion, and acontrol system. The rear wiper assembly comprises a rear wiper arm and arear washer nozzle assembly. The fluid supply portion comprises a supplyreservoir, a washer motor pump, and a fluid delivery conduit. The washermotor pump and the fluid delivery conduit work in conjunction to move afluid from the supply reservoir to the rear wiper assembly. The actuatorportion comprises a wiper driving apparatus and an output shaft. Thewiper driving apparatus is operatively coupled to the output shaft andthe output shaft is operatively coupled to the rear wiper arm. Theoperation of the wiper driving apparatus at least partially causes theoscillation of the rear wiper arm. The control system comprises a firstswitch, a second switch, a third switch, a fourth switch, and a fifthswitch. The first switch generates an input signal indicating a vehicleignition status. The second switch is for initiating a process formoving the rear windshield from a fully closed position to an openposition. The third switch is for generating an input signal indicatingthe position of the rear windshield. The fourth switch is for initiatinga process for operating the washer motor pump. The fifth switch is forinitiating a process for causing the oscillation of the rear wiper arm.The control system determines the position of the rear windshield priorto initiating the process for operating the washer motor pump and thecontrol system prevents the initiation of the process for operating thewasher motor pump if the rear windshield is determined to be in an openposition. The control system determines the position of the rearwindshield prior to initiating the process for causing the oscillationof the rear wiper arm and the control system prevents the initiation ofthe process for causing the oscillation of the rear wiper arm if therear windshield is determined to be in an open position. The controlsystem causes the termination of the operation of the washer motor pumpand causes the termination of the oscillation of the rear wiper arm uponthe initiation of a process for moving the rear windshield from a fullyclosed position to an open position during the operation of either thewasher motor pump or the oscillation of the rear wiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshield ispivotally coupled to the rear-facing side and encloses the aperture andthe rear wiper-washer system comprises a rear wiper assembly, a fluidsupply portion, an actuator portion, and a control system. The rearwiper assembly comprises a rear wiper arm and a rear washer nozzleassembly. The fluid supply portion comprises a supply reservoir, awasher motor pump, and a fluid delivery conduit. The washer motor pumpand the fluid delivery conduit work in conjunction to move a fluid fromthe supply reservoir to the rear wiper assembly. The actuator portioncomprises a wiper driving apparatus and an output shaft. The wiperdriving apparatus is operatively coupled to the output shaft and theoutput shaft is operatively coupled to the rear wiper arm. The operationof the wiper driving apparatus at least partially causes the oscillationof the rear wiper arm. The control system comprises a first switch, asecond switch, a third switch, a fourth switch, and a fifth switch. Thefirst switch generates an input signal indicating a vehicle ignitionstatus. The second switch is for initiating a process for moving therear windshield from a fully closed position to an open position. Thethird switch is for generating an input signal indicating the positionof the rear windshield. The fourth switch is for initiating a processfor operating the washer motor pump. The fifth switch is for initiatinga process for causing the oscillation of the rear wiper arm. The controlsystem determines the position of the rear windshield prior toinitiating the process for operating the washer motor pump and thecontrol system prevents the initiation of the process for operating thewasher motor pump if the rear windshield is determined to be in an openposition. The control system determines the position of the rearwindshield prior to initiating the process for causing the oscillationof the rear wiper arm and the control system prevents the initiation ofthe process for causing the oscillation of the rear wiper arm if therear windshield is determined to be in an open position. The controlsystem causes the termination of the operation of the washer motor pumpand causes the termination of the oscillation of the rear wiper arm uponthe initiation of a process for moving the rear windshield from a fullyclosed position to an open position during the operation of either thewasher motor pump or the oscillation of the rear wiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshield isfixedly attached to the rear-facing side and encloses the aperture.

The rear wiper-washer system comprises a rear wiper assembly, a fluidsupply portion, an actuator portion, and a control system. The rearwiper assembly comprises a rear wiper arm and a rear washer nozzleassembly. The fluid supply portion comprises a supply reservoir, awasher motor pump, and a fluid delivery conduit. The washer motor pumpand the fluid delivery conduit work in conjunction to move a fluid fromthe supply reservoir to the rear wiper assembly. The actuator portioncomprises a wiper driving apparatus and an output shaft. The wiperdriving apparatus is operatively coupled to the output shaft and theoutput shaft is operatively coupled to the rear wiper arm. The operationof the wiper driving apparatus at least partially causes the oscillationof the rear wiper arm. The control system comprises a first switch, asecond switch, a third switch, a fourth switch, and a fifth switch. Thefirst switch generates an input signal indicating a vehicle ignitionstatus. The second switch is for initiating a process for moving therear windshield from a fully closed position to an open position. Thethird switch is for generating an input signal indicating the positionof the rear windshield. The fourth switch is for initiating a processfor operating the washer motor pump. The fifth switch is for initiatinga process for causing the oscillation of the rear wiper arm. The controlsystem determines the position of the rear windshield prior toinitiating the process for operating the washer motor pump and thecontrol system prevents the initiation of the process for operating thewasher motor pump if the rear windshield is determined to be in an openposition. The control system determines the position of the rearwindshield prior to initiating the process for causing the oscillationof the rear wiper arm and the control system prevents the initiation ofthe process for causing the oscillation of the rear wiper min if therear windshield is determined to be in an open position. The controlsystem causes the termination of the operation of the washer motor pumpand causes the termination of the oscillation of the rear wiper arm uponthe initiation of a process for moving the rear windshield from a fullyclosed position to an open position during the operation of either thewasher motor pump or the oscillation of the rear wiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshieldencloses the aperture and the rear wiper-washer system comprises a rearwiper assembly, a fluid supply portion, an actuator portion, and acontrol system. The rear wiper assembly comprises a rear wiper arm and arear washer nozzle assembly. The fluid supply portion comprises a supplyreservoir, a washer motor pump, and a fluid delivery conduit. The washermotor pump and the fluid delivery conduit work in conjunction to move afluid from the supply reservoir to the rear wiper assembly. The supplyreservoir and the washer motor pump are located within an interior spacedefined by an outer surface of the rear-facing side. The actuatorportion comprises a wiper driving apparatus and an output shaft. Thewiper driving apparatus is operatively coupled to the output shaft andthe output shaft is operatively coupled to the rear wiper arm. Theoperation of the wiper driving apparatus at least partially causes theoscillation of the rear wiper arm. The control system comprises a firstswitch, a second switch, a third switch, a fourth switch, and a fifthswitch. The first switch generates an input signal indicating a vehicleignition status. The second switch is for initiating a process formoving the rear windshield from a fully closed position to an openposition. The third switch is for generating an input signal indicatingthe position of the rear windshield. The fourth switch is for initiatinga process for operating the washer motor pump. The fifth switch is forinitiating a process for causing the oscillation of the rear wiper arm.The control system determines the position of the rear windshield priorto initiating the process for operating the washer motor pump and thecontrol system prevents the initiation of the process for operating thewasher motor pump if the rear windshield is determined to be in an openposition. The control system determines the position of the rearwindshield prior to initiating the process for causing the oscillationof the rear wiper arm and the control system prevents the initiation ofthe process for causing the oscillation of the rear wiper arm if therear windshield is determined to be in an open position. The controlsystem causes the termination of the operation of the washer motor pumpand causes the termination of the oscillation of the rear wiper arm uponthe initiation of a process for moving the rear windshield from a fullyclosed position to an open position during the operation of either thewasher motor pump or the oscillation of the rear wiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshieldencloses the aperture and the rear wiper-washer system comprises a rearwiper assembly, a fluid supply portion, an actuator portion, and acontrol system. The rear wiper assembly comprises a rear wiper arm and arear washer nozzle assembly. The fluid supply portion comprises a supplyreservoir, a washer motor pump, and a fluid delivery conduit. The washermotor pump and the fluid delivery conduit work in conjunction to move afluid from the supply reservoir to the rear wiper assembly. The supplyreservoir and the washer motor pump are located within an enginecompartment. The actuator portion comprises a wiper driving apparatusand an output shaft. The wiper driving apparatus is operatively coupledto the output shaft and the output shaft is operatively coupled to therear wiper arm. The operation of the wiper driving apparatus at leastpartially causes the oscillation of the rear wiper arm. The controlsystem comprises a first switch, a second switch, a third switch, afourth switch, and a fifth switch. The first switch generates an inputsignal indicating a vehicle ignition status. The second switch is forinitiating a process for moving the rear windshield from a fully closedposition to an open position. The third switch is for generating aninput signal indicating the position of the rear windshield. The fourthswitch is for initiating a process for operating the washer motor pump.The fifth switch is for initiating a process for causing the oscillationof the rear wiper arm. The control system determines the position of therear windshield prior to initiating the process for operating the washermotor pump and the control system prevents the initiation of the processfor operating the washer motor pump if the rear windshield is determinedto be in an open position. The control system determines the position ofthe rear windshield prior to initiating the process for causing theoscillation of the rear wiper arm and the control system prevents theinitiation of the process for causing the oscillation of the rear wiperarm if the rear windshield is determined to be in an open position. Thecontrol system causes the termination of the operation of the washermotor pump and causes the termination of the oscillation of the rearwiper arm upon the initiation of a process for moving the rearwindshield from a fully closed position to an open position during theoperation of either the washer motor pump or the oscillation of the rearwiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshieldencloses the aperture and the rear wiper-washer system comprises a rearwiper assembly, a fluid supply portion, an actuator portion, and acontrol system. The rear wiper assembly comprises a rear wiper arm and arear washer nozzle assembly. The fluid supply portion comprises a supplyreservoir, a washer motor pump, and a fluid delivery conduit. The washermotor pump and the fluid delivery conduit work in conjunction to move afluid from the supply reservoir to the rear wiper assembly. The actuatorportion comprises a wiper driving apparatus and an output shaft. Thewiper driving apparatus is operatively coupled to the output shaft andthe output shaft is operatively coupled to the rear wiper ann. Theoperation of the wiper driving apparatus at least partially causes theoscillation of the rear wiper arm. The wiper driving apparatus is atleast partially positioned within an interior space defined by an outersurface of the rear-facing side. The wiper driving apparatus comprises arear wiper motor, a rear wiper down relay, and a rear wiper up relay.The control system comprises a first switch, a second switch, a thirdswitch, a fourth switch, and a fifth switch. The first switch generatesan input signal indicating a vehicle ignition status. The second switchis for initiating a process for moving the rear windshield from a fullyclosed position to an open position. The third switch is for generatingan input signal indicating the position of the rear windshield. Thefourth switch is for initiating a process for operating the washer motorpump. The fifth switch is for initiating a process for causing theoscillation of the rear wiper arm. The control system determines theposition of the rear windshield prior to initiating the process foroperating the washer motor pump and the control system prevents theinitiation of the process for operating the washer motor pump if therear windshield is determined to be in an open position. The controlsystem determines the position of the rear windshield prior toinitiating the process for causing the oscillation of the rear wiper armand the control system prevents the initiation of the process forcausing the oscillation of the rear wiper arm if the rear windshield isdetermined to be in an open position. The control system causes thetermination of the operation of the washer motor pump and causes thetermination of the oscillation of the rear wiper arm upon the initiationof a process for moving the rear windshield from a fully closed positionto an open position during the operation of either the washer motor pumpor the oscillation of the rear wiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear-facing sidecomprises a lift gate. The rear windshield encloses the aperture and therear wiper-washer system comprises a rear wiper assembly, a fluid supplyportion, an actuator portion, and a control system. The rear wiperassembly comprises a rear wiper arm and a rear washer nozzle assembly.The fluid supply portion comprises a supply reservoir, a washer motorpump, and a fluid delivery conduit. The washer motor pump and the fluiddelivery conduit work in conjunction to move a fluid from the supplyreservoir to the rear wiper assembly. The actuator portion comprises awiper driving apparatus and an output shaft. The wiper driving apparatusis operatively coupled to the output shaft and the output shaft isoperatively coupled to the rear wiper arm. The operation of the wiperdriving apparatus at least partially causes the oscillation of the rearwiper arm. The control system comprises a first switch, a second switch,a third switch, a fourth switch, a fifth switch, a sixth switch, and aseventh switch. The first switch generates an input signal indicating avehicle ignition status. The second switch is for initiating a processfor moving the rear windshield from a fully closed position to an openposition. The third switch is for generating an input signal indicatingthe position of the rear windshield. The fourth switch is for initiatinga process for operating the washer motor pump. The fifth switch is forinitiating a process for causing the oscillation of the rear wiper arm.The sixth switch is for generating an input signal indicating theposition of the lift gate. The seventh switch is for initiating aprocess for moving the lift gate from a fully closed position to an openposition. The control system determines the position of the rearwindshield prior to initiating the process for operating the washermotor pump and the control system prevents the initiation of the processfor operating the washer motor pump if the rear windshield is determinedto be in an open position. The control system determines the position ofthe rear windshield and the lift gate prior to initiating the processfor causing the oscillation of the rear wiper arm and the control systemprevents the initiation of the process for causing the oscillation ofthe rear wiper arm if the rear windshield or the lift gate is determinedto be in an open position. The control system causes the termination ofthe operation of the washer motor pump and causes the termination of theoscillation of the rear wiper arm upon the initiation of a process formoving the rear windshield or the lift gate from a fully closed positionto an open position during the operation of either the washer motor pumpor the oscillation of the rear wiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshieldencloses the aperture and the rear wiper-washer system comprises a rearwiper assembly, a fluid supply portion, an actuator portion, and acontrol system. The rear wiper assembly comprises a rear wiper arm and arear washer nozzle assembly. The fluid supply portion comprises a supplyreservoir, a washer motor pump, and a fluid delivery conduit. The washermotor pump and the fluid delivery conduit work in conjunction to move afluid from the supply reservoir to the rear wiper assembly. The actuatorportion comprises a wiper driving apparatus and an output shaft. Thewiper driving apparatus is operatively coupled to the output shaft andthe output shaft is operatively coupled to the rear wiper arm. Theoperation of the wiper driving apparatus at least partially causes theoscillation of the rear wiper arm. The control system comprises a firstswitch, a second switch, a third switch, a fourth switch, and a fifthswitch. The first switch generates an input signal indicating a vehicleignition status. The second switch is for initiating a process formoving the rear windshield from a fully closed position to an openposition. The second switch comprises a plurality of operator actuateddevices. The third switch is for generating an input signal indicatingthe position of the rear windshield. The fourth switch is for initiatinga process for operating the washer motor pump. The fifth switch is forinitiating a process for causing the oscillation of the rear wiper arm.The control system determines the position of the rear windshield priorto initiating the process for operating the washer motor pump and thecontrol system prevents the initiation of the process for operating thewasher motor pump if the rear windshield is determined to be in an openposition. The control system determines the position of the rearwindshield prior to initiating the process for causing the oscillationof the rear wiper arm and the control system prevents the initiation ofthe process for causing the oscillation of the rear wiper arm if therear windshield is determined to be in an open position. The controlsystem causes the termination of the operation of the washer motor pumpand causes the termination of the oscillation of the rear wiper arm uponthe initiation of a process for moving the rear windshield from a fullyclosed position to an open position during the operation of either thewasher motor pump or the oscillation of the rear wiper arm.

According to another embodiment of the invention, a vehicle comprises arear-facing side, a rear windshield, an aperture formed in therear-facing side, and a rear wiper-washer system. The rear windshieldencloses the aperture and the rear wiper-washer system comprises a rearwiper assembly, a fluid supply portion, an actuator portion, and acontrol system. The rear wiper assembly comprises a rear wiper arm and arear washer nozzle assembly. The fluid supply portion comprises a supplyreservoir, a washer motor pump, and a fluid delivery conduit. The washermotor pump and the fluid delivery conduit work in conjunction to move afluid from the supply reservoir to the rear wiper assembly. The actuatorportion comprises a wiper driving apparatus and an output shaft. Thewiper driving apparatus is operatively coupled to the output shaft andthe output shaft is operatively coupled to the rear wiper arm. Theoperation of the wiper driving apparatus at least partially causes theoscillation of the rear wiper arm. The control system comprises a firstswitch, a second switch, a third switch, a fourth switch, and a fifthswitch. The first switch generates an input signal indicating a vehicleignition status. The second switch is for initiating a process formoving the rear windshield from a fully closed position to an openposition. The second switch comprises a plurality of operator actuateddevices. The plurality of operator actuated devices comprise a devicechosen from the group consisting of an interior rear windshield switch,an exterior rear windshield switch, and a key fob having a remote rearwindshield switch. The third switch is for generating an input signalindicating the position of the rear windshield. The fourth switch is forinitiating a process for operating the washer motor pump. The fifthswitch is for initiating a process for causing the oscillation of therear wiper ann. The control system determines the position of the rearwindshield prior to initiating the process for operating the washermotor pump and the control system prevents the initiation of the processfor operating the washer motor pump if the rear windshield is determinedto be in an open position. The control system determines the position ofthe rear windshield prior to initiating the process for causing theoscillation of the rear wiper arm and the control system prevents theinitiation of the process for causing the oscillation of the rear wiperaim if the rear windshield is determined to be in an open position. Thecontrol system causes the termination of the operation of the washermotor pump and causes the termination of the oscillation of the rearwiper arm upon the initiation of a process for moving the rearwindshield from a fully closed position to an open position during theoperation of either the washer motor pump or the oscillation of the rearwiper aim.

One advantage of this invention is that a vehicle operator is preventedfrom accidentally dispensing or spraying washer fluid through a loweredor open rear windshield.

Still other benefits and advantages of the invention will becomeapparent to those skilled in the art to which it pertains upon a readingand understanding of the following detailed specification.

III. BRIEF DESCRIPTION OF THE DRAWINGS

The invention may take physical form in certain parts and arrangement ofparts, embodiments of which will be described in detail in thisspecification and illustrated in the accompanying drawings which form apart hereof and wherein:

FIG. 1 is a perspective view of a vehicle comprising a rear wiper-washersystem according to one embodiment of the invention.

FIG. 2 is a perspective view of a vehicle comprising a lift gate in anopen position according to one embodiment of the invention.

FIG. 3 is a perspective view of a vehicle showing a rear windshield inan open position according to one embodiment of the invention.

FIG. 4 is a perspective view of an interior rear windshield switchpositioned within the interior portion of a vehicle according to oneembodiment of the invention.

FIG. 5 is a perspective view of a remote rear windshield switch locatedon a key fob according to one embodiment of the invention.

FIG. 6 is a block diagram of a fluid supply portion according to oneembodiment of the invention.

FIG. 7 is a perspective cut-away view of an actuator portion and a rearwiper assembly according to one embodiment of the invention.

FIG. 8 is a representation of a rear wiper aim according to oneembodiment of the invention.

FIG. 9 is a representation of a rear wiper arm according to oneembodiment of the invention.

FIG. 10 is a representation of a rear wiper arm according to oneembodiment of the invention.

FIG. 11 is a perspective cut-away view of a washer nozzle assemblyaccording to one embodiment of the invention.

FIG. 12 is a schematic diagram of a control system of a rearwiper-washer system according to one embodiment of the invention.

FIG. 13 is a flow chart illustrating a method to control a rear wiperarm of a rear wiper-washer system according to one embodiment of theinvention.

FIG. 14 is a flow chart illustrating a method to control a washer motorpump of a rear wiper-washer system according to one embodiment of theinvention.

IV. DETAILED DESCRIPTION OF THE INVENTION

Referring now to the drawings wherein the showings are for purposes ofillustrating embodiments of the invention only and not for purposes oflimiting the same, FIGS. 1-3 show a vehicle 10 comprising a rearwindshield 12 and a rear wiper-washer system 20 according to oneembodiment of the invention. The rear windshield 12 may enclose anaperture or opening 11 (as shown in FIG. 3) formed in a rear-facing side13 of the vehicle 10. A pair of hinges 12 a, 12 b may pivotally couplethe rear windshield 12 to the rear-facing side 13. The pair of hinges 12a, 12 b may allow the pivotal movement of the rear windshield 12 betweena fully closed position (as shown in FIG. 1), wherein the rearwindshield 12 is substantially sealed to the rear-facing side 13, and anopen position (as shown in FIG. 3), wherein at least one edge of therear windshield 12 is spaced apart from the corresponding adjacent edgeof the aperture 11. In another embodiment, the rear-facing side 13 maycomprise a lift gate 13′ (as shown in FIG. 2). In yet anotherembodiment, the rear-facing side 13 may be fixedly attached to thevehicle 10. The rear windshield 12 and the rear-facing side 13 maycomprise any type and combination of rear windshield 12 and rear-facingside 13, wherein the rear windshield is able to be opened independent ofthe rear-facing side 13, chosen with the sound judgment used of a personusing ordinary skill in the art.

With reference now to FIGS. 1, 4, and 5, the vehicle 10 may comprise aplurality of operator actuated devices for causing the rear windshield12 or the lift gate 13′ to move between a fully closed position and anopen position. In one embodiment, the plurality of operator actuateddevices for causing the rear windshield 12 or the lift gate 13′ to movebetween the fully closed position and the open position may comprise aninterior rear windshield switch 4 positioned within the interior portion9 of the vehicle 10 (as shown in FIG. 4), an exterior rear windshieldswitch 5 that may be located on the outer surface of the rear windshield12 (as shown in FIG. 1), and a remote rear windshield switch 6 a locatedon a key fob 6 (as shown in FIG. 5). In one embodiment, the key fob 6may comprise an electronic device suitable for placement on a key ringor chain as is well known in the art. The key fob 6 may comprise atleast a first operator actuated button, such as the remote rearwindshield switch 6 a. The operator actuated buttons may allow theoperator to cause the vehicle's doors to lock or unlock or to release oropen the rear windshield 12. The vehicle 10 may comprise any number andtype of device for causing the rear windshield 12 or the lift gate 13′to move from the fully closed position to the open position chosen withthe sound judgment of a person using ordinary skill in the art.

With reference now to FIGS. 1, 6, 7, and 12, the rear wiper-washersystem 20 may comprise a fluid-supply portion 19, an actuator portion40, a rear wiper assembly 58, and a control system 300. The fluid-supplyportion 19 may comprise a supply reservoir 21, a washer motor pump 22,and a fluid delivery conduit 23. The supply reservoir 21 and the washermotor pump 22 may be located within an interior space 16 (shown in FIG.7) defined by an outer surface 14 of the rear-facing side 13. In anotherembodiment, the supply reservoir 21 and the washer motor pump 22 may belocated within an engine compartment (not shown) of the vehicle 10. Thesupply reservoir 21 and the washer motor pump 22 may be located in anyposition chosen with the sound judgment of a person using ordinary skillin the art. The supply reservoir 21 may comprise a tank main body 31, areservoir inlet 32, and a reservoir outlet 33. The reservoir inlet 32may be attached to the top portion 31 a of the tank main body 31 and maycomprise an opening suitable for a vehicle operator to deposit a fluidF, such as a windshield washer cleaning fluid, through the reservoirinlet 32 and into the tank main body 31. The reservoir outlet 33 may beattached to the bottom portion 31 b of the tank main body 31 and mayallow the fluid F to exit the tank main body 31. The fluid deliveryconduit 23 may connect the reservoir outlet 33 to the rear wiper portion58. The washer motor pump 22 may work in conjunction with the fluiddelivery conduit 23 to move the fluid F from the supply reservoir 21 tothe rear wiper assembly 58. Utilizing a pump and conduit to move fluidthrough a conduit is well known in the art and any known method, chosenwith the sound judgment of a person using ordinary skill in the art, maybe used.

With reference now to FIGS. 7-10, and 12, the actuator portion 40 maycomprise a wiper driving apparatus 41 and an output shaft 42. The wiperdriving apparatus 41 may be at least partially positioned within theinterior space 16 of the rear-facing side 13. The wiper drivingapparatus 41 may comprise a rear wiper motor 116, a rear wiper downrelay 117, and a rear wiper up relay 119 (as shown in FIG. 12). The rearwiper driving apparatus 41 may be operatively coupled to the outputshaft 42. The output shaft 42 may extend from within the interior space16 out through the outer surface 14 of the rear-facing side 13. The rearwiper assembly 58 may comprise a rear wiper arm 59 and a rear washernozzle assembly 60. The rear wiper arm 59 may comprise a rear wipershaft 61 and a rear wiper blade 63. The rear wiper shaft 61 may beoperatively coupled to the output shaft 42 such that the operation ofthe wiper driving apparatus 41 may at least partially cause theoscillation or movement of the rear wiper arm 59 as described below. Therear wiper blade 63 may extend from the rear wiper shaft 61 and contactthe rear windshield 12. The rear wiper blade 63 may comprise anon-abrasive flexible composition, such as a rubber, as is well known inthe art, and may contact the rear windshield 12 such that theoscillation of the wiper arm 59 between a first and a second operatingposition OP1, OP2 (as shown in FIG. 10) may cause the rear wiper blade63 to at least partially remove any water, snow, or other debris fromthe rear windshield 12.

With reference now to FIGS. 1 and 11, the rear washer nozzle assembly 60of the rear wiper assembly 58 may allow for the fluid F to be dispensedonto the rear windshield 12. The rear washer nozzle assembly 60 maycomprise a fluid intake portion 65 and a nozzle head portion 66. Thefluid intake portion 65 may be positioned within the interior space 16of the rear-facing side 13. The fluid intake portion 65 may receive thefluid delivery conduit 23 and may allow the fluid F to pass from thefluid delivery conduit 23 to the nozzle head portion 66. The nozzle headportion 66 may be positioned adjacent to the outer surface 14 of therear-facing side 13 adjacent to the rear windshield 12. The nozzle headportion 66 may comprise a nozzle head body 91, a nozzle tip member 92,and a seal plate 93. The nozzle head body 91 may comprise a fluidpassage 96, a nozzle head outlet 97, and a nozzle tip receiving portion98. The seal plate 93 may be attached to the outer surface 14 of therear-facing door 13. The seal plate 93 may contact the nozzle head body91 and the outer surface 14 in such a manner as to create a seal orbarrier that substantially prevents any moisture or debris from passingbetween the nozzle head body 91 and the outer surface 14. The fluidpassage 96 may extend from the fluid intake portion 65, through thenozzle head body 91, and to the nozzle head outlet 97. The nozzle headoutlet 97 may extend through the nozzle tip receiving portion 98connecting the nozzle head body 91 to the nozzle tip member 92. Thenozzle tip member 92 may comprise an outlet passage 92 a and a nozzletip outlet 99. The outlet passage 92 a may allow the fluid F to passfrom the nozzle head outlet 97 to the nozzle tip outlet 99. The nozzletip outlet 99 may allow the fluid F to be dispensed through the washernozzle assembly 60 and onto the rear windshield 12.

With reference now to FIGS. 2 and 12, a simplified schematic diagram ofthe control system 300 of the rear wiper-washer system 20 is shown. Forpurposes of clarity, an embodiment of the control system 300 wherein therear-facing side 13 comprises a lift gate 13′ is described. The controlsystem 300 may comprise an ignition switch 104, a lift gate positionswitch 103, a rear windshield release switch 102, a lift gate releaseswitch 108, a rear windshield position switch 105, a rear windshieldwasher switch 106 and a rear windshield wiper switch 107. The controlsystem 300 may further comprise an input circuit 314, a microprocessor315 and an output circuit 316. The ignition switch 104 may serve togenerate an input signal indicating the vehicle ignition status. In oneembodiment, the ignition switch 104 may generate an input signalindicating the vehicle ignition status as either active or inactive. Thevehicle ignition status may be defined as active when the vehicleignition switch 104 is in a position wherein the electrically poweredvehicle systems, such as the rear wiper-washer system 20, is energized.In one embodiment, the vehicle ignition status is active when thevehicle ignition is in either a “run” or an “accessory” position whereinthe electrically powered vehicle systems are energized by either agenerator or the vehicle battery 101 as is well known in the art. Thevehicle ignition status may be defined as inactive when the vehicleignition switch 104 is in a position wherein the electrically poweredvehicle systems are not energized. In one embodiment, the vehicleignition switch 104 is inactive when the vehicle ignition is in an “off”or “start” position.

With continued reference now to FIGS. 2 and 12, the lift gate positionswitch 103 may serve to generate an input signal indicating whether thelift gate 13′ is in an open position or a fully closed. Similarly, therear windshield position switch 105 may serve to generate an inputsignal indicating whether the rear windshield 12 is in an open positionor a fully closed. As previously stated, the lift gate position and therear windshield position may respectively be defined as fully closedonly when the lift gate 13′ or the rear windshield 12 is securelyclosed. For any other position, such as ajar, the lift gate and rearwindshield positions may respectively be defined as open. The rearwindshield release switch 102 and the lift gate release switch 108 mayserve to generate an input signal indicating the activation of at leastone of the plurality of operator actuated devices for causing the rearwindshield 12 or the lift gate 13′, respectively, and thereby initiatinga process for causing the rear windshield 12 or the lift gate 13′ tomove from the fully closed position to the open position. The rearwindshield washer switch 106 may serve to generate an input signal forinitiating a process for operating the washer motor pump 22 therebycausing the fluid F to be dispensed onto the rear windshield 12. Therear windshield wiper switch 107 may serve to generate an input signalfor initiating a process for causing the rear wiper arm 59 to oscillatebetween the first operating position OP1 and the second operatingposition OP2. In another embodiment, the rear windshield wiper switch107 may comprise an off position 107 a, an intermittent position 107 b,a low position 107 c, and a high position 107 d. The movement of therear windshield wiper switch 107 to the off position 107 a may serve togenerate an input signal for causing the rear wiper arm 59 to move tothe parked position PP. The movement of the rear windshield wiper switch107 to the intermittent position 107 b may serve to generate an inputsignal for initiating a process for causing the rear wiper arm 59 tooscillate intermittently between the first operating position OP1 andthe second operating position OP2. The movement of the rear windshieldwiper switch 107 to the low position 107 c may serve to generate aninput signal for initiating a process for causing the rear wiper arm 59to oscillate between the first operating position OP1 and the secondoperating position OP2 at a first or low speed. The movement of the rearwindshield wiper switch 107 to the high position 107 d may serve togenerate an input signal for initiating a process for causing the rearwiper arm 59 to oscillate between the first operating position OP1 andthe second operating position OP2 at a second or high speed. Theignition switch 104, the lift gate position switch 103, the rearwindshield/tailgate release switch 102, the rear windshield positionswitch 105, the rear windshield washer switch 106, and the rearwindshield wiper switch 107 together may provide a means for generatinga plurality of input signals.

With reference now to FIGS. 2, 7, and 12, the input circuit 314 may bein electrical communication with the ignition switch 104, the lift gateposition switch 103, the rear windshield/tailgate release switch 102,the rear windshield position switch 105, the rear windshield washerswitch 106, and the rear windshield wiper switch 107. The input circuit314 may serve to buffer and filter the plurality of input signalsgenerated during operation of the rear wiper-washer system 20. Themicroprocessor 315 may also be in electrical communication with theinput circuit 314. The microprocessor 315 and the input circuit 314 maytogether provide a means for receiving and processing the plurality ofinput signals generated by the ignition switch 104, the lift gateposition switch 103, the rear windshield release switch 102, the rearwindshield position switch 105, the rear windshield washer switch 106,and the rear windshield wiper switch 107 in order to determineappropriate operations for the rear wiper-washer system 20. Themicroprocessor 315 may also be programmed and/or manufactured to providevarious means for deciding to actuate the rear wiper arm 59 according tothe method of the present invention as described in more detail below.The microprocessor 315 may also be in electrical communication withoutput circuit 316. The output circuit 316 may generate an output signalto control the rear wiper-washer sytem 20 in response to the pluralityof inputs received by the input circuit 314. The output circuit 316 mayactivate or deactivate the rear wiper up relay 119 and the rear wiperdown relay 117. The rear wiper up relay 119 and the rear wiper downrelay 117 may be in electrical communication with the rear wiper drivingapparatus 41 to cause the rear wiper arm 59 to actuate. A rear wipermotor status switch 109 may also be in electrical communication with therear wiper driving apparatus 41 and with the control system 300 toprovide feedback to the microprocessor 315 relating to the position ofthe rear wiper arm 59.

With reference now to FIGS. 1 and 13, a flow chart of a control method400 for controling the operation of the rear wiper-washer system 20 isshown. The rear windshield wiper switch 107 may transmit an input signalto the input circuit 314 indicating an active rear wiper status (stepS401). The active rear wiper status may result from the vehicle operatormanipulating the rear windshield wiper switch 107 from the off positionto either the interval position, the low position, or the high positionin order to cause the rear wiper arm 59 to oscillate between the firstoperating position OP1 and the second operating position OP2. Uponreceipt of the input signal from the rear windshield wiper switch 107,the microprocessor 315 may determine the position of the rear windshield12 (step S402). In one embodiment, the microprocessor 315 may determinethe position of the rear windshield 12 based on data stored in aninternal memory module (not shown) of the control system 300 wherein thedata indicates the current status of the rear windshield position switch105. The microprocessor 315 may determine the position of the rearwindshield 12 utilizing any known method chosen with the sound judgmentof a person using ordinary skill in the art.

With continued reference now to FIGS. 1 and 13, if the microprocessor315 determines that the rear windshield 12 is in the fully closedposition, the microprocessor 315 may then determine the position of thelift gate 13′ (step S403). In one embodiment, the microprocessor 315 maydetermine the position of the lift gate 13′ based on data stored in aninternal memory module (not shown) of the control system 300 wherein thedata indicates the current status of the lift gate position switch 103.If the microprocessor 315 determines that the rear windshield 12 and thelift gate 13′ are in the fully closed position, the microprocessor 315may cause the output circuit 316 to generate an output signal thatcauses the rear wiper arm 59 to oscillate between the first operatingposition OP1 and the second operating position OP2 (step S404).

With reference now to FIGS. 1, 6, 7, 12, and 14, the rear windshieldwasher operation will generally be described. In one embodiment, thevehicle operator may manipulate the rear windshield washer switch 106from an off position to an on position in order to cause the fluid F tobe dispensed onto the rear windshield 12. The rear windshield washerswitch 106 may transmit an input signal to the input circuit 314indicating an active rear washer status (step S450). Upon receipt of theinput signal from the rear windshield washer switch 106, themicroprocessor 315 may determine the position of the rear windshield 12(step S451) and the position of the lift gate 13′ (step S452) asdescribed above. If the microprocessor 315 determines that the rearwindshield 12 and the lift gate 13′ are in the fully closed position,the microprocessor 315 may cause the output circuit 316 to generate anoutput signat that causes the washer motor pump 22 to operate (stepS453) thereby causing the fluid F to be dispensed onto the rearwindshield 12 as described above.

With continued reference now to FIGS. 1, 6, 7, 12, and 14, in oneembodiment, the microprocessor 315 may determine the status of the rearwiper switch 107 (step S453 a). If the microprocessor 315 determines thestatus of the rear wiper switch 107 to be active, the microprocessor 315allows the rear wiper arm 59 to continue oscillating between the firstoperating position OP1 and the second operation position OP2 during theoperation of the washer motor pump 22. If the microprocessor 315determines the status of the rear wiper switch 107 to be inactive, themicroprocessor 315 may cause the rear the output circuit 316 to generatean output signal that causes the rear wiper arm 59 to oscillate betweenthe first operating position OP1 and the second operating position OP2for a predetermined number of oscillations (step S453 c). In oneembodiment, the output circuit 316 may generate an output signal thatcauses the rear wiper arm 59 to oscillate between the first operatingposition OP1 and the second operating position OP2 at the second speedS2. In another embodiment, the output circuit 316 may generate an outputsignal that causes the rear wiper arm 59 to oscillate between the firstoperating position OP1 and the second operating position OP2 at thethird speed S3. The output circuit 316 may generate an output signalthat causes the rear wiper arm 59 to oscillate between the firstoperating position OP1 and the second operating position OP2 at anyspeed chosen with the sound judgment of a person using ordinary skill inthe art.

With reference now to FIGS. 1, 6-8, 12, and 14, if, during the operationof the washer motor pump 22 or the rear wiper arm 59, the control system300 determines the initiation of a process to move either the rearwindshield 12 or the lift gate 13′ from the closed position, the controlsytem 300 may disable the rear wiper-washer system 20. In oneembodiment, during the operation of either the washer motor pump 22 orthe oscillation of the rear wiper arm 59, the rear windshield/tailgaterelease switch 102 may transmit an input signal to the input circuit 314indicating the actuation of one of the plurality of manually actuateddevices for causing the rear windshield 12 or the lift gate 13′ to movefrom the fully closed position. The microprocessor 315 may process theinput signal and determine the initiation of a process to move eitherthe rear windshield 12 or the lift gate 13′ from the closed position.The microprocessor may then disable the rear wiper-washer system 20. Inone embodiment, the control system 300 may disable the rear wiper-washersystem 20 by terminating the operation of the washer motor pump 22 andthe rear wiper motor 116. In another embodiment, the microprocessor 315may disable the washer motor pump 22 and the rear wiper motor 116 bypreventing the output circuit from generating any output signal that maycause the washer motor pump 22 or the rear wiper motor 116 to operate.In yet another embodiment, the microprocessor 315 may cause the outputcircuit 316 to generate an output signal activating the rear wiper downrelay 117 thereby causing the rear wiper arm 59 to move to the parkedposition PP. Substantially simultaneously, the microprocessor 315 maycause the termination of the operation of the washer motor pump 22. Themicroprocessor 315 may cause the rear wiper-washer system 20 to remaindisabled until the microprocessor 315 determines that both the rearwindshield 12 and the lift gate 13′ are in the fully closed position.

Numerous embodiments have been described, hereinabove. It will beapparent to those skilled in the art that the above methods andapparatuses may incorporate changes and modifications without departingfrom the general scope of this invention. It is intended to include allsuch modifications and alterations in so far as they come within thescope of the appended claims or the equivalents thereof.

Having thus described the invention, it is now claimed:
 1. A methodcomprising the steps of: (a) receiving a first input signal, wherein thefirst input initiates a process for causing the operation of a washermotor pump; (b) determining the position of a rear windshield; (c)operating the washer motor pump, wherein the washer motor pump operatesto dispense a fluid onto the rear windshield, only if the position ofthe rear windshield is determined to be fully closed.
 2. The method ofclaim 1, wherein step (c) further comprises the steps of: determiningthe actuation of one of a plurality of operator actuated devices forcausing the rear windshield to move from the fully closed position; and,causing the termination of the operation of the washer motor pump. 3.The method of claim 1, wherein step (b) further comprises the step of:determining the position of a lift gate and operating the washer motorpump only if the position of the lift gate is determined to be fullyclosed.
 4. The method of claim 3, wherein step (c) further comprises thestep of: determining the actuation of one of a plurality of operatoractuated devices for causing the lift gate to move from the fully closedposition; and, causing the termination of the operation of the washermotor pump.
 5. The method of claim 1, wherein step (c) further comprisesthe step of: oscillating a rear wiper arm between a first operatingposition and a second operating position. 6-14. (canceled)
 15. A methodcomprising the steps of: (a) providing a vehicle comprising: (1) arear-facing side; (2) a rear windshield; and, (3) an aperture formed inthe rear-facing side; wherein the rear windshield is positional into afully closed position where the rear windshield encloses the apertureand an open position where the rear windshield does not enclose theaperture; (b) providing a rear wiper-washer system comprising: (1) arear wiper arm that is operable to at least partially remove debris fromthe rear windshield; and, (2) a fluid supply device that is operable tosupply a fluid to the rear windshield; (c) providing a control systemcomprising: (1) a rear windshield position switch for use in generatinga signal indicating the position of the rear windshield; and, (2) afluid supply switch for use in generating an input signal to operate thefluid supply device to supply the fluid to the rear windshield; (d)activating the fluid supply switch to generate the input signal tooperate the fluid supply device to supply the fluid to the rearwindshield; (e) determining with the control system the position of therear windshield; and, (f) sending an output signal with the controlsystem to operate the fluid supply device to supply the fluid to therear windshield only if the control system first determines that therear windshield is in the fully closed position.
 16. The method of claim15 wherein: step (c) comprises the step of: providing the control systemwith a rear windshield wiper switch for use in generating an inputsignal to operate the rear wiper arm to remove debris from the rearwindshield; step (d) comprises the step of: activating the rearwindshield wiper switch to generate the input signal to operate the rearwiper arm to remove debris from the rear windshield; and, step (f)comprises the step of: sending an output signal with the control systemto operate the rear wiper arm to remove debris from the rear windshieldonly if the control system first determines that the rear windshield isin the fully closed position.
 17. The method of claim 16 wherein step(f) comprises the step of: sending an output signal with the controlsystem to position the rear wiper arm in a parked position if thecontrol system determines that the rear windshield is in the openposition
 18. The method of claim 15 wherein: step (a) comprises the stepof: providing the rear-facing side with an opening and a lift gate thatis positional into a fully closed position where the lift gate enclosesthe opening and an open position where the lift gate does not enclosethe opening; wherein the aperture and rear windshield are mounted to thelift gate; step (c) comprises the step of: providing the control systemwith a lift gate position switch for use in generating a signalindicating the position of the lift gate; and, step (f) comprises thestep of: sending an output signal with the control system to operate thefluid supply device to supply the fluid to the rear windshield only ifthe control system first determines that the lift gate is in the fullyclosed position.
 19. The method of claim 18 wherein: the method furthercomprises the step of: providing a lift gate operator actuatableelectrical switch for use in generating an input signal to position thelift gate into the open position; and, step (f) comprises the step ofdetermining that the lift gate is in the open position if the lift gateoperator actuable electrical switch has generated an input signal toposition the lift gate into the open position.
 20. The method of claim15 wherein: the method further comprises the step of: providing awindshield operator actuatable electrical switch for use in generatingan input signal to position the rear windshield into the open position;and, step (e) comprises the step of: determining that the rearwindshield is in the open position if the windshield operator actuatableelectrical switch has generated an input signal to position the rearwindshield into the open position.
 21. The method of claim 21 whereinthe windshield operator actuatable electrical switch is positionedwithin an interior portion of the vehicle.
 22. The method of claim 21wherein the windshield operator actuatable electrical switch ispositioned on an exterior surface of the vehicle.
 23. The method ofclaim 21 wherein the windshield operator actuatable electrical switch ispositioned on a key fob.
 24. The method of claim 15 wherein: step (b)comprises the step of: providing the fluid supply device with a motorpump that is operable to supply the fluid to the rear windshield; and,step (f) comprises the step of terminating the operation of the motorpump if the control system determines that the rear windshield is in theopen position.
 25. The method of claim 15 wherein step (f) comprises thestep of: preventing the control system from generating an output signalto the fluid supply device if the control system determines that therear windshield is in the open position.
 26. A method comprising thesteps of: (a) providing a vehicle comprising: (1) a rear-facing side;(2) a rear windshield; and, (3) an aperture formed in the rear-facingside; wherein the rear windshield is positional into a fully closedposition where the rear windshield encloses the aperture and an openposition where the rear windshield does not enclose the aperture; (b)providing a rear wiper-washer system comprising: (1) a rear wiper armthat is oscillateable to at least partially remove debris from the rearwindshield; and, (2) a fluid supply device that is operable to supply afluid to the rear windshield; (c) providing a control system comprising:(1) a rear windshield position switch for use in generating a signalindicating the position of the rear windshield; (2) a fluid supplyswitch for use in generating an input signal to operate the fluid supplydevice to supply the fluid to the rear windshield; and, (3) a rearwindshield wiper switch for use in generating an input signal tooscillate the rear wiper arm to remove debris from the rear windshield;(d) providing a windshield operator actuatable electrical switch for usein generating an input signal to position the rear windshield into theopen position; (e) activating the fluid supply switch to generate theinput signal to operate the fluid supply device to supply the fluid tothe rear windshield; (f) activating the rear windshield wiper switch togenerate the input signal to oscillate the rear wiper arm to removedebris from the rear windshield; (g) determining with the control systemthe position of the rear windshield; wherein step (g) comprises the stepof: determining that the rear windshield is in the open position if thewindshield operator actuatable electrical switch has generated an inputsignal to position the rear windshield into the open position; (h)sending an output signal with the control system to operate the fluidsupply device to supply the fluid to the rear windshield only if thecontrol system first determines that the rear windshield is in the fullyclosed position; and, (i) sending an output signal with the controlsystem to oscillate the rear wiper arm to remove debris from the rearwindshield only if the control system first determines that the rearwindshield is in the fully closed position.
 27. The method of claim 26wherein: step (a) comprises the step of: providing the rear-facing sidewith an opening and a lift gate that is positional into a fully closedposition where the lift gate encloses the opening and an open positionwhere the lift gate does not enclose the opening; wherein the apertureand rear windshield are mounted to the lift gate; step (c) comprises thestep of: providing the control system with a lift gate position switchfor use in generating a signal indicating the position of the lift gate;and, step (h) comprises the step of: sending an output signal with thecontrol system to operate the fluid supply device to supply the fluid tothe rear windshield only if the control system first determines that thelift gate is in the fully closed position.
 28. The method of claim 27wherein: the method further comprises the step of: providing a lift gateoperator actuatable electrical switch for use in generating an inputsignal to position the lift gate into the open position; and, step (h)comprises the step of determining that the lift gate is in the openposition if the lift gate operator actuable electrical switch hasgenerated an input signal to position the lift gate into the openposition.
 29. The method of claim 28 wherein step (h) comprises the stepof: preventing the control system from generating an output signal tothe fluid supply device if the control system determines that the rearwindshield is in the open position.